E1 or Fractional E1 Access Unit

• One or two data ports
• Selectable sync data rates: n x 56 kbps, n x 64 kbps
• Data interfaces: V.35, RS-530, V.36/RS-449, X.21
• Optional sub-E1 drop-and-insert port for PBX connectivity
• Fail-safe sub-E1 ensuring uninterrupted service
• Operates with RAD's DXC multiservice access node for multilink star configuration
• In-band remote SNMP-based management
• Main link available with optional integral LTU or with fiber optic modem 24-hour performance monitoring storage
• Alarm mask configuration for any alarm

• Simple to operate
• Fast access rates
• Integrated Ethernet bridge/router option, enabling LAN extension
• Multiple services transmitted from a single source
• Management timeslots: Allows management of all FCD-IP chain via single DTS
• Default startup configuration simplifies installation

The FCD-E1 is an access unit for full of fractional E1 services. The FCD-E1 can be ordered with either one or two data ports and with an optional sub-E1 drop-and-insert port. The data port rates are selectable for any multiple of 56 kbps or 64 kbps, up to 1,984 kbps. Alternatively, one of the data ports can be replaced by an Ethernet bridge, providing direct connection to the LAN.

Internal or external line termination unit

The FCD-E1 access unit is available with or without an internal LTU (line termination unit), allowing direct connection to the E1 network or connection via an external LTU.

The FCD-E1 access unit can operate with RAD's modular DXC multiservice access node products for multilink star applications, including access to SDH networks. The DXC units and the FCD-E1 operate under centralized SNMP network management.

Programmable timeslot allocation

Timeslot assignment is programmable, allowing data from each data port and from the sub-E1 port to be placed into timeslots on the main link, either consecutively or alternately. The FCD-E1 access unit also allows flexible timeslot allocation of the data port timeslots. Each timeslot of the sub-E1 port is placed on the same timeslot of the main E1 link.

Multiple clock source selection ensures maximum flexibility, both for the main link and for the data ports, enabling the support of different applications.

Immunity to hardware and power failures is provided by bypassing the sub-E1 port to the main E1 link, ensuring uninterrupted service to the sub-E1 port.

The E1 interface meets all requirements of ITU recommendations G.703, G.704, G.706 and G.732. It supports both two and 16 frames per multi-frame, with or without CRC-4. Zero suppression over the line is HDB3. The integral LTU ensures a range of up to 2 km (1.2 miles).

Setup, control and monitoring

Setup, control and monitoring of status and diagnostic information can be activated in four ways:

• Front panel LCD with pushbuttons (menu-driven management)
• ASCII terminal connected to the async control port (command line interpreter)
• SNMP management connected to the async control port
• In-band management through a dedicated timeslot or TS0, supporting proprietary protocol and Frame Relay RFC 1490

The FCD-E1 supports an internal SNMP agent and can be controlled by any generic SNMP station or by the RADview-HPOV SNMP network management application.

The FCD-E1 access unit supports dial-in/dial-out, which can be used for remote out-of-band configuration and monitoring (dial-in) and for alarms (dial-out).

Maintenance capabilities include user-activated local and remote loopbacks and internal BERTs on the main E1 link, sub-E1 link and data ports.

The FCD-E1 access unit is available as a standalone unit for the desktop or a 19-inch rack shelf.